A one-dimensional model for the transport of a sediment mixture in non-equilibrium conditions

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Abstract
The non-stationary one-dimensional continuity equations of each granulometric class of sediments are written for the waterstream (suspended transport), the bottom layer (bedload transport) and the mixing layer below the bottom surface. Proper closure equations have been introduced to express the transversal sediment (luxes between these three layers, accounting for the different adaptation-length of each grainsize class. A number of examples are given, showing the importance of non-equilibrium for non-uniform particles in erosion-deposition processes at short time-scale.

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